<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		*{
			margin:0px;
			padding:0px;
		}
		div.center{
			width: 1090px;
			margin:0 auto;
		}
		header{
			width: 100%;
			height: 176px;
			background-color: red;
			/*position: fixed;
			top: 0px;*/
		}

		article{
			height: 800px;
			background-color: pink;
			/*margin-top: 176px;*/
		}
		header div{
			height: 50px;
			background-color: blue;
			border:3px solid orange;
		}

		/*header div:last-child{
			background-color: orange;
			position: sticky;
			top: 0px;
		}*/

		div.center div.header_nav{
			width: 100%;
			height:50px;
			background-color: orange;
			margin-top: 112px;
			float: left;
			position: sticky;
			top: 0px;
		}
		article{
			width: 100%;
			display: inline-block;
		}
		article section{
			width: 110px;
			height: 364px;
			border:2px solid blue;
			margin-left: 30px;
			margin-top: 30px;
			position: sticky;
			top: 70px;
		}
	</style>
</head>
<body>
	<div class="outer">
		<div class="center">
			<div class="header_nav"></div>
			<header>
				<div></div>
				<div></div>
			</header>

			<article>
				<section>
					
				</section>
			</article>
			<footer></footer>
			
			
			
		</div>
	</div>
</body>
</html>






